Mobility

It's also useless in maps with monsters, cause if you get KB'd, it screws the whole thing over.

No it's not, you just get bumped and when you land, you perform another and fly right pass the mob. And then there's freeze standing.

I believe that only works for buffs. Because I can totally use a potion while I'm using triple throw. And gunslingers can totally back me up when I say that recoil shot doesn't cause this lag at all.

Attack skills don't cause "pot lag", pots are the ones that cause pot lag. You can pot right away after you use an attack skill, but you can't attack right away after you use a pot. Item pick-up also causes the same "pot lag". This is why you can keep brandishing the same skele for a whole minute while lagging but you can't use your brandish anymore after you use a pot. It's also why it's more efficient to pot/loot in between attack animations while they're still active because the pot lag delay would be gone by the time your attack animation is complete.